style.css

* {
    font-family: 'Roboto', sans-serif;
}

ul {
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

li {
    display: inline;
    display: flex;
    justify-content: space-between;
}

body {
    margin: 0;
    padding: 0;
}

.flex {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-items: center;
    align-items: center;
}

.row {
    width: 100%;
    display: flex;
    justify-items: center;
    align-items: center;
    flex-direction: row;
}

.auto-margin {
    margin: auto;
}

.header {
    width: 100%;
    padding: 25px;
    margin: 0;
    background-color: #FF4455;
}

.list {
    padding: 25px;
}

.header .flex h1 {
    color: white;
}

.done {
    text-decoration: line-through;
    color: #FF4455;
}

#checkboxes label {
    float: left;
}

#checkboxes ul {
    margin: 0;
    list-style: none;
    float: left;
}

.btn {
    background-color: #FF4455;
    border: none;
    color: white;
    margin-left: 25px;
    padding: 5px 8px;
    font-size: 16px;
    cursor: pointer;
}

/* Darker background on mouse-over */
.btn:hover {
    background-color: #db0012;
}

.hide {
    display: none;
}

.btn:last-of-type {
    margin-left: 0px;
}

.todo-list {
    display: flex;
    justify-items: center;
    align-items: center;
}

.todo {
    display:flex;
    justify-content: space-between;
    margin-bottom: 25px;
}

.todo .edit-field {
    display: none;
}

.todo.edit-mode .checkbox-field {
    display: none;
}

.todo.edit-mode .edit-field {
    display: block;
}

.todo:last-of-type {
    margin-bottom: 0px;
}

.edit-todo-btn-container {
    display: flex;
    justify-content: space-evenly;
    margin-top: 5px;
}